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United States weather

Weather in Allen County, Indiana for September 2025

Your guide to Allen County weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Allen County is cooler than usual, with temperatures averaging 23.2 °F, this is -3.2 °F below the typical seasonal average.

  • The forecast for the next days in Allen County predicts temperatures to be around 26 °F, close to the historical average.

  • In general, the average temperature in Allen County at the beginning of September is 26.7 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 20.6 °F by the end of September.

    • Rain 🌧️

  • The climate of Allen County in September is notably wet, with an average of 12 rainy days, and a total of 67.9 mm of precipitation.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
18
Dry days
Average rainy days
12
Rainy days
Average snowy days
0
Snow days
Average temperatures
26°/13°
Temperatures
Average wind speed
17 km/h
Avg max wind
Average humidity
67 %
Avg humidity

Allen County Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Sunny
28°
2
Sunny
28°
3
Mist
29°
4
Partly cloudy
28°
5
Thundery outbreaks possible
29°
6
Light rain shower
24°
7
Fog
21°
8
Mist
21°
9
Mist
26°
10
Mist
27°
11
Mist
29°
12
Fog
27°
13
Mist
26°
14
Mist
29°
15
Sunny
31°
16
Partly cloudy
30°
17
Partly cloudy
26°
18
Overcast
34°
19
Sunny
35°
20
Patchy rain possible
29°
21
Moderate rain
30°
22
Patchy rain possible
30°
23
Patchy rain possible
21°
24
Patchy rain possible
19°
25
Patchy rain possible
13°
26
Patchy rain possible
18°
27
Sunny
23°
28
Patchy rain possible
25°
29
Patchy rain possible
22°
30
Mist
24°

Temperatures trend during September in Allen County

See the weather trend as well as the moving average line

September weather in Allen County day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
Sept. 1 Sunny
Sunny
 28° /10° 0 mm 7
Sept. 2 Sunny
Sunny
 28° /10° 0 mm 7
Sept. 3 Mist
Mist
 29° /13° 0 mm 7
Sept. 4 Partly cloudy
Partly cloudy
 28° /13° 3.5 mm 7
Sept. 5 Thundery outbreaks possible
Thundery outbreaks possible
 29° /14° 0 mm 7
Sept. 6 Light rain shower
Light rain shower
 24° /13° 4.4 mm 5
Sept. 7 Fog
Fog
 21° /9° 0.7 mm 5
Sept. 8 Mist
Mist
 21° /7° 0 mm 5
Sept. 9 Mist
Mist
 26° /9° 0 mm 6
Sept. 10 Mist
Mist
 27° /12° 0 mm 6
Sept. 11 Mist
Mist
 29° /14° 0.1 mm 7
Sept. 12 Fog
Fog
 27° /12° 2.4 mm 6
Sept. 13 Mist
Mist
 26° /12° 10.2 mm 6
Sept. 14 Mist
Mist
 29° /12° 0 mm 7
Sept. 15 Sunny
Sunny
 31° /12° 0 mm 1.5
Sept. 16 Partly cloudy
Partly cloudy
 30° /13° 0 mm 1.5
Sept. 17 Partly cloudy
Partly cloudy
 26° /15° 0 mm 1.4
Sept. 18 Overcast
Overcast
 34° /20° 0 mm 1.4
Sept. 19 Sunny
Sunny
 35° /18° 0.1 mm 0
Sept. 20 Patchy rain possible
Patchy rain possible
 29° /17° 0.3 mm 5
Sept. 21 Moderate rain
Moderate rain
 30° /16° 5.8 mm 5
Sept. 22 Patchy rain possible
Patchy rain possible
 30° /17° 2.8 mm 5
Sept. 23 Patchy rain possible
Patchy rain possible
 21° /15° 2.6 mm 4
Sept. 24 Patchy rain possible
Patchy rain possible
 19° /12° 1 mm 4
Sept. 25 Patchy rain possible
Patchy rain possible
 13° /12° 3.4 mm 3
Sept. 26 Patchy rain possible
Patchy rain possible
 18° /12° 0.3 mm 3
Sept. 27 Sunny
Sunny
 23° /10° 0 mm 5
Sept. 28 Patchy rain possible
Patchy rain possible
 25° /12° 0.1 mm 4
Sept. 29 Patchy rain possible
Patchy rain possible
 22° /16° 18.3 mm 5
Sept. 30 Mist
Mist
 24° /15° 0 mm 6
Next
Important Notice
Our weather forecast for Allen County in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Allen County forecast closer to your planned date for the most up-to-date weather information.
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Allen County in September - FAQ

What are the expected maximum and minimum temperatures in Allen County during September?
Enjoy moderate daytime temperatures of up to 26° and cooler nights around 13°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Allen County during September?
Moderate rainfall is anticipated in Allen County during September, with a total of 67.9 mm spread over approximately 12 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Allen County during September?
The average wind speed in Allen County during September is 17 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Allen County

Explore the daily rainfall trends and prepare for Allen Countys September weather 💧

UV exposure in Allen County during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Fort Wayne
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Location coordinates Where is Allen County?

Get accurate weather forecasts for Allen County, located at latitude 41.131 and longitude -85.129. Stay updated with localized weather information tailored for Allen County.

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